How to get the idea to identify correct order for E.A,atomic radii,I.P ,E.N,? And what else can be done to good in periodic table?

Dear Student,

You should be aware of the trends in the periodic table and exceptions if any. 
For eg. atomic radii increases on going from top to bottom in a group because as we go down the group, number of shells increases and the nuclear charge remains same. This causes the size of the atom to increase. Also, if we go from left to right across a period, the number of shells remain same while the effective nuclear charge increases as the atomic number increaseses. Therefore, the size of atomic decreases.
Electronegativity increases as we go from left to right across a period and decreases on going from top to bottom in a group.
Ionisation potential also increases from left to right across a period and decreases from top to bottom in a group.
Electron affinity decreases or becomes more negative as we go from left to right across a period and increases or becomes more positive as we go from top to bottom in a group.

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